4 files changed, 24 insertions, 0 deletions

diff --git a/arch/ia64/kernel/topology.c b/arch/ia64/kernel/topology.c
index a2484fc1a06..abb17a613b1 100644
--- a/arch/ia64/kernel/topology.c
+++ b/arch/ia64/kernel/topology.c
@@ -27,6 +27,15 @@
 
 static struct ia64_cpu *sysfs_cpus;
 
+void arch_fix_phys_package_id(int num, u32 slot)
+{
+#ifdef CONFIG_SMP
+        if (cpu_data(num)->socket_id == -1)
+                cpu_data(num)->socket_id = slot;
+#endif
+}
+EXPORT_SYMBOL_GPL(arch_fix_phys_package_id);
+
 int arch_register_cpu(int num)
 {
 #if defined (CONFIG_ACPI) && defined (CONFIG_HOTPLUG_CPU)
diff --git a/drivers/acpi/processor_core.c b/drivers/acpi/processor_core.c
index dd28c912e84..5241e3ff508 100644
--- a/drivers/acpi/processor_core.c
+++ b/drivers/acpi/processor_core.c
@@ -603,6 +603,15 @@ static int acpi_processor_get_info(struct acpi_processor *pr, unsigned has_uid)
                 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
         }
 
+        /*
+         * If ACPI describes a slot number for this CPU, we can use it
+         * ensure we get the right value in the "physical id" field
+         * of /proc/cpuinfo
+         */
+        status = acpi_evaluate_object(pr->handle, "_SUN", NULL, &buffer);
+        if (ACPI_SUCCESS(status))
+                arch_fix_phys_package_id(pr->id, object.integer.value);
+
         return 0;
 }
 
diff --git a/include/asm-ia64/topology.h b/include/asm-ia64/topology.h
index f2f72ef2a89..32863b3bb1d 100644
--- a/include/asm-ia64/topology.h
+++ b/include/asm-ia64/topology.h
@@ -116,6 +116,8 @@ void build_cpu_to_node_map(void);
 #define smt_capable()                           (smp_num_siblings > 1)
 #endif
 
+extern void arch_fix_phys_package_id(int num, u32 slot);
+
 #define pcibus_to_cpumask(bus)  (pcibus_to_node(bus) == -1 ? \
                                         CPU_MASK_ALL : \
                                         node_to_cpumask(pcibus_to_node(bus)) \
diff --git a/include/asm-x86/topology.h b/include/asm-x86/topology.h
index 0e6d6b03aff..4f35a0fb4f2 100644
--- a/include/asm-x86/topology.h
+++ b/include/asm-x86/topology.h
@@ -193,6 +193,10 @@ extern cpumask_t cpu_coregroup_map(int cpu);
 #define topology_thread_siblings(cpu)           (per_cpu(cpu_sibling_map, cpu))
 #endif
 
+static inline void arch_fix_phys_package_id(int num, u32 slot)
+{
+}
+
 struct pci_bus;
 void set_pci_bus_resources_arch_default(struct pci_bus *b);